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Classify each of the following monosaccharides as either d
Chapter 24, Problem 24.42(choose chapter or problem)
Classify each of the following monosaccharides as either d or l, as either an aldo or a keto sugar, and as a tetrose, pentose, or hexose: C H OH H OH CH2OH H O (a) C H OH H OH H O CH2OH HO H (b) C H OH HO H H O CH2OH H OH (c) C H OH HO H H O H OH CH2OH H OH (d) (e) C O HO H CH2OH H OH
Questions & Answers
QUESTION:
Classify each of the following monosaccharides as either d or l, as either an aldo or a keto sugar, and as a tetrose, pentose, or hexose: C H OH H OH CH2OH H O (a) C H OH H OH H O CH2OH HO H (b) C H OH HO H H O CH2OH H OH (c) C H OH HO H H O H OH CH2OH H OH (d) (e) C O HO H CH2OH H OH
ANSWER:Step 1 of 7
To determine if a sugar is D or L, we need to look at the chiral carbon furthest from the carbonyl group (when drawn in a Fischer projection). If the hydroxyl group is pointing to the right, it is a D sugar; if the hydroxyl group is pointing to the left, it is an L sugar.
If the compounds carbonyl group belongs to an aldehyde then it si an aldo sugar; if the carbonyl group is part of ketone functionality then it is a keto sugar.
Finally, the total number of carbon atoms in the monosaccharide determines whether it is a tetrose (4 carbons), pentose (5 carbons), or hexose (6 carbons).
With these guidelines in place, we can begin to examine the structures we have been given.